coverage.c (get_coverage_counts): Give a different message if flag_guess_branch_prob is set.

	* coverage.c (get_coverage_counts): Give a different message
	if flag_guess_branch_prob is set.
	* predict.c (counts_to_freqs): Return an int.
	(estimate_bb_frequencies): If counts_to_freqs returns zero,
	calculate estimates.

From-SVN: r76741